It appears to be a thin metal impression (or electrotype) of the reverse side of a coin from Retegno, a commune within the Duchy of Milan, of Antonio Teodoro Trevulzio, minted between 1676 and 1678. The shield features a crowned head with three merged faces, between the words VNICA and MENS: http://www.rhinocoins.com/ITALY/SEC2/REANTE.HTML
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